require 'active_record_unit'

class ActiveRecordStoreTest < ActionDispatch::IntegrationTest
  class TestController < ActionController::Base
    def no_session_access
      head :ok
    end

    def set_session_value
      raise "missing session!" unless session
      session[:foo] = params[:foo] || "bar"
      head :ok
    end

    def get_session_value
      render :text => "foo: #{session[:foo].inspect}"
    end

    def get_session_id
      render :text => "#{request.session_options[:id]}"
    end

    def call_reset_session
      session[:foo]
      reset_session
      reset_session if params[:twice]
      session[:foo] = "baz"
      head :ok
    end

    def renew
      env["rack.session.options"][:renew] = true
      session[:foo] = "baz"
      head :ok
    end

    def rescue_action(e) raise end
  end

  def setup
    ActiveRecord::SessionStore.session_class.create_table!
  end

  def teardown
    ActiveRecord::SessionStore.session_class.drop_table!
  end

  %w{ session sql_bypass }.each do |class_name|
    define_method("test_setting_and_getting_session_value_with_#{class_name}_store") do
      with_store class_name do
        with_test_route_set do
          get '/set_session_value'
          assert_response :success
          assert cookies['_session_id']

          get '/get_session_value'
          assert_response :success
          assert_equal 'foo: "bar"', response.body

          get '/set_session_value', :foo => "baz"
          assert_response :success
          assert cookies['_session_id']

          get '/get_session_value'
          assert_response :success
          assert_equal 'foo: "baz"', response.body

          get '/call_reset_session'
          assert_response :success
          assert_not_equal [], headers['Set-Cookie']
        end
      end
    end

    define_method("test_renewing_with_#{class_name}_store") do
      with_store class_name do
        with_test_route_set do
          get '/set_session_value'
          assert_response :success
          assert cookies['_session_id']

          get '/renew'
          assert_response :success
          assert_not_equal [], headers['Set-Cookie']
        end
      end
    end
  end

  def test_getting_nil_session_value
    with_test_route_set do
      get '/get_session_value'
      assert_response :success
      assert_equal 'foo: nil', response.body
    end
  end

  def test_calling_reset_session_twice_does_not_raise_errors
    with_test_route_set do
      get '/call_reset_session', :twice => "true"
      assert_response :success

      get '/get_session_value'
      assert_response :success
      assert_equal 'foo: "baz"', response.body
    end
  end

  def test_setting_session_value_after_session_reset
    with_test_route_set do
      get '/set_session_value'
      assert_response :success
      assert cookies['_session_id']
      session_id = cookies['_session_id']

      get '/call_reset_session'
      assert_response :success
      assert_not_equal [], headers['Set-Cookie']

      get '/get_session_value'
      assert_response :success
      assert_equal 'foo: "baz"', response.body

      get '/get_session_id'
      assert_response :success
      assert_not_equal session_id, response.body
    end
  end

  def test_getting_session_value_after_session_reset
    with_test_route_set do
      get '/set_session_value'
      assert_response :success
      assert cookies['_session_id']
      session_cookie = cookies.send(:hash_for)['_session_id']

      get '/call_reset_session'
      assert_response :success
      assert_not_equal [], headers['Set-Cookie']

      cookies << session_cookie # replace our new session_id with our old, pre-reset session_id

      get '/get_session_value'
      assert_response :success
      assert_equal 'foo: nil', response.body, "data for this session should have been obliterated from the database"
    end
  end

  def test_getting_from_nonexistent_session
    with_test_route_set do
      get '/get_session_value'
      assert_response :success
      assert_equal 'foo: nil', response.body
      assert_nil cookies['_session_id'], "should only create session on write, not read"
    end
  end

  def test_getting_session_id
    with_test_route_set do
      get '/set_session_value'
      assert_response :success
      assert cookies['_session_id']
      session_id = cookies['_session_id']

      get '/get_session_id'
      assert_response :success
      assert_equal session_id, response.body, "should be able to read session id without accessing the session hash"
    end
  end

  def test_doesnt_write_session_cookie_if_session_id_is_already_exists
    with_test_route_set do
      get '/set_session_value'
      assert_response :success
      assert cookies['_session_id']

      get '/get_session_value'
      assert_response :success
      assert_equal nil, headers['Set-Cookie'], "should not resend the cookie again if session_id cookie is already exists"
    end
  end

  def test_prevents_session_fixation
    with_test_route_set do
      get '/set_session_value'
      assert_response :success
      assert cookies['_session_id']

      get '/get_session_value'
      assert_response :success
      assert_equal 'foo: "bar"', response.body
      session_id = cookies['_session_id']
      assert session_id

      reset!

      get '/get_session_value', :_session_id => session_id
      assert_response :success
      assert_equal 'foo: nil', response.body
      assert_not_equal session_id, cookies['_session_id']
    end
  end

  def test_allows_session_fixation
    with_test_route_set(:cookie_only => false) do
      get '/set_session_value'
      assert_response :success
      assert cookies['_session_id']

      get '/get_session_value'
      assert_response :success
      assert_equal 'foo: "bar"', response.body
      session_id = cookies['_session_id']
      assert session_id

      reset!

      get '/set_session_value', :_session_id => session_id, :foo => "baz"
      assert_response :success
      assert_equal session_id, cookies['_session_id']

      get '/get_session_value', :_session_id => session_id
      assert_response :success
      assert_equal 'foo: "baz"', response.body
      assert_equal session_id, cookies['_session_id']
    end
  end

  private

    def with_test_route_set(options = {})
      with_routing do |set|
        set.draw do
          match ':action', :to => 'active_record_store_test/test'
        end

        @app = self.class.build_app(set) do |middleware|
          middleware.use ActiveRecord::SessionStore, options.reverse_merge(:key => '_session_id')
          middleware.delete "ActionDispatch::ShowExceptions"
        end

        yield
      end
    end

    def with_store(class_name)
      session_class, ActiveRecord::SessionStore.session_class =
        ActiveRecord::SessionStore.session_class, "ActiveRecord::SessionStore::#{class_name.camelize}".constantize
      yield
      ActiveRecord::SessionStore.session_class = session_class
    end
end